The fuel we get here in the south is already "10 % max ethanol"....or thats what all the pumps are marked with anyways. If thats right then that would mean 1 whole gallon of ethanol per 10 gallons purchased ? Thats seems like alot but must be safe to some sort of a degree or it would screw up whatever you put it in...right? Hell i dont know, i wouldnt add 2 or 3 gallons per fill up tho thats for sure. Like they all said above, its take so damn much of it in comp to gasoline. It would be ridiculous to use 100% eth unless you got access to a sheetload of it. I couldnt tell you where to get some around here, never seem a station that offered it.